Human beings are created for unity. Put bluntly, male genital organs and female genital organs are both necessary for reproduction and no human can procreate alone in any natural way. But this complementarity extends beyond simple physical necessity and compatibility. Rather, as Pope St John Paul II (General Audience, 7 November 1979) has argued in his interpretation of the second Genesis narrative, men and women are better together. In Genesis, God decides that it is not good for the first human being (who arguably has no sexual identity) to be alone. Despite the presence of all the animals the first human being is not happy. So God puts the human being to sleep and creates another human being from the same flesh (the rib) of the first human being. When they awaken, the first human being recognizes the second as 'flesh of my flesh' and expresses, for the first time, joy. In other words, human beings find joy and completion in other human beings. Man and woman find joy and completion in each other. The complementarity of woman and man is characterised by: a) equal dignity; b) significant difference; c) synergetic relation—meaning something more happens when you have woman and man together, e.g. generation of a child or generation of the joy of mutual love; d) intergenerational fruition—in other words the human species and the expression of culture goes on generation after generation after generation across historical time. (Allen, 2014).